[Bug 194664] New: radeonkms_load="YES" halts system, Failed to load firmware!

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194664

            Bug ID: 194664
           Summary: radeonkms_load="YES" halts system, Failed to load
                    firmware!
           Product: Base System
           Version: 10.1-RC2
          Hardware: amd64
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: crum.zach at gmail.com

Created attachment 148741
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=148741&action=edit
dmesg output from system

When enabled, the radeon kms driver appears to halt the kernel. The only way to
rescue the system is to use a different boot drive and remove the offending
line from /boot/loader.conf.local 

This is the only part of the trace I can capture

info: [drm] radeon_read_bios: ===> Try PCI Expansion ROM...
info: [drm] radeon_read_bios: Map address: 0xffff800000c0000 (131072 bytes)
info: [drm] ATOM BIOS: CAYMAN
drmn0: info: VRAM: 2048M 0x0000000000000000 - 0x000000007FFFFFFF (2048M used)
drmn0: info: GTT: 512M 0x0000000000000000 - 0x000000009FFFFFFF
info: [drm] Detected VRAM RAM=2048M, BAR=256M
info: [drm] RAM width 256bits DDR
[TTM] Zone kernel: Available graphics memory: 8374848 kiB
[TTM] Zone  dma32: Available graphics memory: 2097152 kiB
[TTM] Initializing pool allocator
info: [drm] radeon: 2048M of VRAM memory ready
info: [drm] radeon: 512M of GTT memory ready.
info: [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
info: [drm] Driver supports precise vblank timestamp query.
info: [drm] radeon: irq initialized.
info: [drm] GART: num cpu pages 131072, num gpu pages 131072
info: [drm] probinggen 2 caps for device 1022:9603 = 2/0
info: [drm] enabling PCIE gen 2 link speeds, disable with radeon.pcie_gen2=0
info: [drm] Loading CAYMn Microcode
error: [drm:pid0:ni_init_microcode] *ERROR* ni_cp: Failed to load firmware
"radeonkmsfw_CAYMAN_pfp"
error: [drm:pid0:cayman_startup] *ERROR* Failed to load firmware!
drmn0: error: disabling GPU acceleration
drmn0: warning: 0xffffff800075f6800 unpin not necessary
drmn0: warning: 0xffffff800075f6800 unpin not necessaary
error: [drm:pid0:cayman_init] *ERROR* radeon: MC ucode required for NI+.
drmn0: error: Fatal error during GPU init
info: [drm] radeon: finished device.
[TTM] Finalizing pool allocator

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